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Be aware how your voice works. Have you ever pulled the open end of an air filled balloon tight and the air rushes out at a squeal like pitch, then the more you open the balloon, the quieter and lower the pitch gets. This is a literal representation of your vocal chords.
The vocal folds give the singer a wide range of control over the pitch of the sound produced. While vocal folds is more descriptive than vocal cords, there is some similarity to a vibrating string in that the pitch produced depends upon the length, mass and tension of the vocal folds.